I have this same looking stone , very good hight end finisher . Levell 5 but on the soft side - just perfect for raising slurry with a very hard tomo . Same acid wellow color sluryq it almost doesnt drink watter at all .
140 x 80 mm size x 1.8 sm Verry intresting swirl patern - maybe an asagi from tomae layer
This stone is number 9 and came with a number 10 jnat and a nagura , witch i believe is unstamped koma

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